On-line measurement apparatus and method of thickness of non-contact object

Abstract

The invention provides an on-line measurement apparatus and method of thickness of a non-contact object. The apparatus comprises a light source, an optical fiber, an optical probe A, an optical probe B, a one-dimensional moving platform support, a transmission belt, a roller, a to-be-measured objet, a one-dimensional moving platform, a spectrograph, a data line, and a computer. The object is conveyed into a measurement range of the probes by the transmission belt; and light emitted by the light source enters the optical probes by coupling. On the basis of a confocal principle, the optical probe A can receive light reflected back by the upper surface of the object and the optical probe B can receive light reflected back by the lower surface; the data are fed back to the computer to obtain the thickness of the object; the computer determines the object thickness; and when the condition is met, no prompting is carried out; and when a set range is exceeded, the computer provides alarming information that the object does not meet the standard. The apparatus with a simple structure can be operated conveniently; the measurement precision is high; and the apparatus can be applied to large-scale flow line production and thus has the great practical value.

Description

technical field [0001] The invention relates to the field of non-contact detection, in particular to an object thickness detection device and method. Background technique [0002] Contact measurement and non-contact measurement are two existing measurement methods. [0003] Contact measurement is easy to operate, but there are also obvious defects, such as: 1. Frequent contact between the probe and the surface during the measurement process may damage the original surface finish, and may also cause the probe to wear and affect the accuracy. 2. Generally speaking, the speed of contact measurement is relatively slow, which is not suitable for collecting a large amount of data. At the same time, it is also easily affected by the operation and temperature of the measuring personnel, and the efficiency is low and the stability is not high. [0004] In contrast, non-contact measurement technology has developed rapidly in recent years due to its advantages of fast, accurate, and ...

AI Technical Summary

Problems solved by technology

[0003] Contact measurement is easy to operate, but there are also obvious defects, such as: 1. Frequent contact between the probe and the surface during the measurement process may damage the original surface finish, and may also cause the probe to wear and affect the accuracy

2. Generally speaking, the speed of contact measurement is relatively slow, which is not suitable for collecting a large number of data

Among the non-contact detection methods, there are laser triangulation, ultrasonic thickness measurement, interferometry, etc. Among them, the accuracy of laser triangulation is generally about 3 μm, which cannot meet the requirements for some relatively high-precision measurements, while interferometry is more susceptible to Influenced by external factors, the stability is not very good

[0005] Nowadays, many flat sheets or flat glass have thickness requirements when making them, so each batch of products needs to be screened, which is time-consuming and inefficient if done manually

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